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The other fishery has seen its fish drop from being a good choice of haddock to buy to one to eat only occasionally, with a "three" rating.

Bernadette Clarke, the MCS Good Fish Guide manager, said: "These ratings changes have come about because scientific perception of the stock has changed.

"Compared to 2015, the stock numbers in 2016 were below the recommended level and at the point where action is now needed to increase the number of fish of breeding age."

There is more positive news for some other fisheries, with scampi from Farn Deeps fishery being upgraded from the lowest rating of "five" - a fish to avoid - to a "four" thanks to better management, though it is still some way off being sustainable.

There are also improvements for scampi fisheries in the west of Scotland, Clyde and Jura catch areas in the latest list from the society.

People buying American lobster are advised to choose ones which come from fisheries with a Marine Stewardship Council certification, which means they implement stronger management to protect stocks and habitat and prevent bycatch.

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The Marine Conservation Society also has ratings for different types of tuna from around the world and different methods of catching them, including nets, long lines and pole and line fisheries.

MCS sustainable seafood work is supported by players of the People's Postcode Lottery, whose head of charities Clara Govier, said: "It is great to see a whole range of resources giving people the power to make their own choices on which seafood to eat.

"However you access it, the Good Fish Guide gives instant advice on what to eat and how to cook it, whether you're shopping for the family in the supermarket or looking for a place to eat out."